I had to do one under my pad, because it had to be engineered, and the engineer called for it. My concrete guy swore and said he hated installing the stuff, and engineers always call for it. So expect a bit of resistance. I'm not sure if you can do less than 10mm, it was what was spec'ed for mine. Fortunately the concrete guy had some leftover from another job he wanted to get rid of so gave it to me for cheap.
As for it being required, a lot of what I read said it really helped. My epoxy hasn't had any bubbling or hot tire pickup. It's been great, would highly recommend it.
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